Casing shoe attachment



Jan. 10, 1933. F, D U HERTY 1,894,212

, CASING SHOE ATTACHMENT Filed Sept. 2, 1927 Patented Jan. 10, 1933 UNITED STATES PATENT! OFFICE CHARLES E. DQUGHEBTY, OF

casme snon ATTACHMENT Application filed September 2, 1927. saw 110. 217,075..

This invention relates to a device designed for attachment to the end of a well casing and more particularlyto the casing shoe as used in oil wells. 7

T In the borin of oil wells, more-particular ly by rotar rills, the casing as let down into the we is provided with a shoe made of steel and of substantial construction. In order to guide the shoe into place, coupled thereto is a guide comprising a hollow head. which tapers to its terminal in order to cause the shoe to pass obstructions, this head being of a material such as cast iron, which is friable under the action of a drill in the well,

so that the drill can pass therethrough and leave the shoe in place to set on the well bottom. The guide has a terminal opening which is closed by a valve held on its seat at the guide terminal by a spring. This valve not only serves the function of permitting the veasin to be floated into the well, but also permitting flushing and washing out of the hole as well as to permit cement to be pumped therethrough in order to cement the casing in place.

Where the valve is at the terminal of the uide, it is liable to strike obstructions, therey interfering with its operation and even breaking the same. One of the objects of this invention, therefore, is toprovide a device of the character described, in which the valve seat is within the head and above the terminal opening, so that this valve will be protected.

Another object of'this invention is toprovide a device of the general character described, the terniinal of which is a definite nozzle adapted to direct a stream down into the hole so as to forcibly wash the cavings ahead of the casing. Another object is to provide a device of the general character described, in which the terminal opening or outlet is susceptible of adjustment to meet requirements in the sinking of a casing and in the cementing thereof. Further objects will appear from the detail description, taken in connection with the accompanying drawing, in which- Figure 1 is an elevation, partly in section,

shcawing one embodiment of this invention; an 4 Figure 2 is a ure 1. v I

Referring to the accompanying drawing, 1 deslgnates a casing shoe which may be of the usual construction and which may ,in some cases be a part of the well casing itself; the cas ng shoe, where employed, is usually made of steel and of substantial form, being provided at its upper end with threads (not shown) for coupling to a casing'and at its lower end with threads to permit couplin thereto of a guide or other device; the end 0 the shoe maybe, as usual, provided with an inclined finish'ed face 2.

The device embodying this invention, one embodiment of which is illustrated comprises a head having a coupling or necl: 3 (in this case shown as reduced with respect to the head) and threaded to take into the shoe; 1t W111 be understood, of course, that any other suitable coupling arrangement may be provided. The head itself is of substantiall the diameter of the shoe and has a shoul er 4 co-operating with the face 2.011 the shoe. its terminal, which is proyided with an 0 enmg or outlet, as shown. The headfis 01- low and, as shown, has a partition 5 integral therewith and providing a valve seat 6 which Is arranged to co-operate with a valve 7, the

section on the line 2-2 of Fig- The head tapers from theshoulder to stem 8 of which. passes through a guide or preferably formed as a separate plug arranged to be screwed into the head so that it may be removed and replaced, the screw threads being shown at 14. There are additional openings 15 arranged around the 1102- zle opening, each opening being threaded to receive a plug 16, while bosses 17 are provided its valve can, therefore, be used not only as a guide, butalso as a float plug, a washdown plug, and as a cementing plug. Since the head can be made of cast iron, it is suf- Jficiently friable under the action of a drill in the 'well that it can be bored out and the cuttings discarded without interfering with further operations.

The nozzle 12 provides means whereby a stream can be directed down into the hole in order to wash the cavings ahead of the casing, and to wash out the bottom of the hole so that the casing can be let down. The somewhat elongated shape of the inside faces 13 particularly permits of a strong solid concentrated stream being forced down the hole. When required, the opening in the bottom of the head can be adjusted or enlarged either by the removal of one or more plugs 16, and to a considerable extent, by the removal of the nozzle plug 12. Accordingly, this device is adapted to'a variety of conditions encountered 1n the boring and sinking of casings in oil and gas wells.

While the invention is particularly ap-- plicable in the relation shown, it will be understood that it is applicable in many cases in other relations. It will, furthermore, be understood that certain features and subcombinations are of utility and may be employed withoutreference to other features, operations and sub-combinations that is contemplated by and is within the scope of the appended claims. It is, furthermore, obvious that various changes may be made in details, within the scope of the appended claims, without departing from the spirit of this invention. It is, therefore, to be under: stood that this invention is not to be limited to the specific details shown and /or described.

Having thus described theinvention, what is claimed is:

1. A device designedfor attachment to the end of a well casing shoe to extend therebeyond when attached to provide a guide therefor, comprising, a hollow head having at one end a coupling, the projecting portion of said head having a tapered rim portion adapted to provide a casing guide, an elongated widemouthed nozzle beyond said rim portion at the tip of said head adapted to project a strong concentrated stream down into the hole, a plurality of auxiliary jet outlets adjacent said nozzles, and removable closures for said outlets.

2. A device designed for attachment to the end of a 'well casing shoe to extend therebeyond when attached to'provide a guide therefor, comprising, a hollow head having at one end a coupling, the projecting portion of said head having aitapered rim portion adapted to provide a casing guide, an elongated widemouthed nozzle at the tip of said head adapted to roject a strong concentrated stream down 1nto the hole, a plurality of auxiliar jet outlets adjacent said nozzle, removab e closures for said outlets, and a float valve in said head.

.3. 'A device designed for attachment to the end of a well casin shoe to extend therebeyond when attache toprovide a guide therefor, comprising, a hollow head having at one end a coupling, the projecting portion of said head having a tapered rim portion adapted to provide a casing guide, an elongated wide-mouthed nozzle removably fitted 1n the tip of said head adapted to project a strong concentrated stream down into the hole, a plurality of auxiliary jet outlets adj acent said nozzle, and removable closures for said outlets.

4. A device designed for attachment to the end of a well casing'shoe to extend therebeyond when attached to provide a guide therefor, comprisin a hollow head having at its upper end a re uced threaded neck adapted to couple with a shoe, the head below said neck being tapered inwardly and downwardl to provide a guide, a partition in said has below said neck and providedv with a seat, a

' valve engagin said seat and having an upwardly exten ing stem, and a bearing for said stem mounted in said neck above said partition.

5. A device designed for attachment to the end of a well casing shoe to extend therebeyond when attached to provide a guide therefor, comprising, a hollow head ha-vin at its upper end a reduced threaded neck apted to couple with a shoe, the head below said neck being tapered inwardly and downwardly to provide a guide, a partition in said head extending inwardly and downwardly below saidneck and provided with a seat, a valve engaging said seat and having an upwardly extending stem, and a bearin for said stem mounted in said neck above said partition.

6. A device designed for attachment to the end of a well casin shoe to extend therebeyond when attache to provide a guide therefor, comprising, a hollow head havin at its upper end a reduced threaded neck a apted to couple with a shoe, the head below said neck being tapered inwardly and downwardly and havin a nozzle at its lower end, a partition in sai head below said neck and provided with a seat, a valve engaging said seat and havin an upwardly extending stem, and a bearing or said stem mounted in said neck above said partition.

7. A device designed for attachment to the end of a well casing shoe to extend therebeyond when attached to provide a guide therefor, comprisin a hollow head having at its upper end a re uced threaded neck adapted to couple with a shoe, the head below said neck being tapered inwardly and downwardly and havin a nozzle at its lower end, a partition in sai head extendin inwardly and downwardly below saidnec and provided with a seat, a valve engaging said seat and having m an upwardly extendin stem, and a bearin for said stem mounted 1n said neck above sai partition.

In testimony whereof I afiix my signature this 22nd da of Jul 1927.

0 RL sF. DOUGHERTY. 

